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Several authors have determined spectra and fine spectra of different lower triangular and upper triangular matrices over different sequence spaces with non-zero diagonals as entries of some constant sequences or some convergent sequences. In this article we determine the spectra and fine spectra of the upper triangular matrix $$U\left( {r_1 ,r_2 ;s_1 ,s_2 } \right) $$ U r 1 , r 2 ; ...
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